IWDFUsbTargetDevice::RetrieveDeviceInformation method

The RetrieveDeviceInformation method retrieves device information of the specified type.

Syntax


HRESULT RetrieveDeviceInformation(
  [in]       ULONG InformationType,
  [in, out]  ULONG *BufferLength,
  [out]      PVOID Buffer
);

Parameters

InformationType [in]: The type of information that the UMDF driver requests about the device.
BufferLength [in, out]: A pointer to a variable that, on input, contains the size, in bytes, of the buffer that RetrieveDeviceInformation supplies in Buffer. On output, this parameter contains the size that RetrieveDeviceInformation requires for Buffer.
Buffer [out]: A pointer that receives the buffer that contains the device information.

Return value

RetrieveDeviceInformation returns one of the following values:

Return code	Description
S_OK	RetrieveDeviceInformation successfully retrieved the device information.
E_OUTOFMEMORY	RetrieveDeviceInformation encountered an allocation failure.
An error code that is defined in Winerror.h	This value corresponds to the error code that the WinUsb API returned.

Remarks

For information about valid information types that a UMDF driver can pass for the InformationType parameter, see the WinUsb_QueryDeviceInformation function.

If InformationType is DEVICE_SPEED (0x01), on successful return, Buffer indicates the operating speed of the device. 0x03 indicates high-speed or higher; 0x01 indicates full-speed or lower.

The RetrieveDeviceInformation method generates a UMDF request and synchronously sends the request to the I/O target.

Examples

For a code example of how to use theRetrieveDeviceInformation method, see IWDFUsbTargetPipe::SetPipePolicy.

Requirements

End of support	Unavailable in UMDF 2.0 and later.
Minimum UMDF version	1.5
Header	Wudfusb.h (include Wudfusb.h)
DLL	WUDFx.dll